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Note 14 - Stockholders' Equity - Option Activity (Details) - $ / shares
12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Outstanding, options (in shares) 604,200 612,000  
Outstanding, weighted average exercise price per share (in dollars per share) $ 6.19 $ 6.23  
Outstanding, weighted average grant-date fair value per share (in dollars per share) $ 1.58 $ 1.59  
Outstanding, weighted average remaining contractual term (Year) 2 years 302 days 2 years 105 days 3 years 98 days
Forfeited or expired, options (in shares) (335,000) (7,800)  
Forfeited or expired, weighted average exercise price per share (in dollars per share) $ 6.97 $ 5.54  
Forfeited or expired, weighted average grant-date fair value per share (in dollars per share) $ 1.08 $ 2.69  
Outstanding, options (in shares) 269,200 604,200 612,000
Outstanding, weighted average exercise price per share (in dollars per share) $ 5.22 $ 6.19 $ 6.23
Outstanding, weighted average grant-date fair value per share (in dollars per share) $ 2.19 $ 1.58 $ 1.59
Vested and exercisable, options (in shares) 269,200    
Vested and exercisable, weighted average exercise price per share (in dollars per share) $ 5.22    
Vested and exercisable, weighted average grant-date fair value per share (in dollars per share) $ 2.19    
Vested and exercisable, weighted average remaining contractual term (Year) 2 years 302 days